OIL for my new gears...

scale · 01-24-2002, 07:38 PM

Here is a simple question

I had 373s put in to replace my stock gears in my 91 coupe. The gears drove me for about 500 - 700 miles....maybe less. The car has been sitting for quite a spell now and i was playing with the idea of popping off the cover, draining and filling back up.

I need to know what the best gear oil (weight and brand) to stick and and about how much i will need. I have red that some people use some purple something or other oil. I just can remember the name. Anyone have any recommendations for me?

Also, i poked my head under it and cant see the filler hole on the case cover ...i am assuming it is on top of the pumpkin. How much oil do i put in.........i dont want to over fill.

I am also going to be putting on a polished stock intake to replace my crusty old grey one. Anyone know where i can get good quality Gasket sets for the rear pumpkin and also my upper intake manifold?

I cant wait to get started...i am probably throwing on some new headers and maybe an h-pipe as well.

Tony Frank · 01-24-2002, 08:17 PM

If i were you i wouldnt put in a synthetic type oil in the rear, i tired that and when i was doing a burnout at the track the rear clutches were slipping and only one wheel was spinning, i talked to a rearend guy and he said it was because of the synthetic oil back there, so go with what was in it stock id say.

Bad89stang · 01-25-2002, 01:52 AM

I use Red Line 75W90 synthetic gear oil. Never had a problem spinning both wheels. Guess it could if the trac loc needed a rebuild, but it wouldn't matter what type of oil you used. All you need for the diff cover is RTV sealant. I use the orange RTV for the diff cover. The upper intake gasket can be found at most auto parts stores. I used the Fel-Pro and have re-used it several times with no problems.

01-24-2002, 07:38 PM	#1
scale Registered Member Join Date: Mar 2000 Location: minneapolis, mn Posts: 158	OIL for my new gears... Here is a simple question I had 373s put in to replace my stock gears in my 91 coupe. The gears drove me for about 500 - 700 miles....maybe less. The car has been sitting for quite a spell now and i was playing with the idea of popping off the cover, draining and filling back up. I need to know what the best gear oil (weight and brand) to stick and and about how much i will need. I have red that some people use some purple something or other oil. I just can remember the name. Anyone have any recommendations for me? Also, i poked my head under it and cant see the filler hole on the case cover ...i am assuming it is on top of the pumpkin. How much oil do i put in.........i dont want to over fill. I am also going to be putting on a polished stock intake to replace my crusty old grey one. Anyone know where i can get good quality Gasket sets for the rear pumpkin and also my upper intake manifold? I cant wait to get started...i am probably throwing on some new headers and maybe an h-pipe as well. __________________ 1991 LX coupe,AOD, red, 80k, K&N, MAC cat back, MAC off-road X, Autometer Gauges, BBK Ceramic unequals, fully polished upper intake, fuel rails, and egr, working on installing.....MM full length subs, H&R sport springs, MM Lower control arms, MM caster camber plates, bilstein shocks, struts.

01-24-2002, 08:17 PM	#2
Tony Frank Registered Member Join Date: Feb 2001 Location: Brooklyn originally, but Grand Rapids now Posts: 309	If i were you i wouldnt put in a synthetic type oil in the rear, i tired that and when i was doing a burnout at the track the rear clutches were slipping and only one wheel was spinning, i talked to a rearend guy and he said it was because of the synthetic oil back there, so go with what was in it stock id say. __________________ Grand Valley State University Senior Accounting and Finance Major 1985 Mustang GT 19,000 ORIGINAL miles, E-303 cam, edelbrock performer RPM intake, holley 600 cfm carb, MAC headers, windage tray, 8.8 rear end with 4.10 gears, 4"cowl hood, 5lug conversion, 04 Mach1 wheels. http://www.mustangworks.com/cgi-bin/moi-display.cgi?1501

01-25-2002, 01:52 AM	#3
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	Gear oil... I use Red Line 75W90 synthetic gear oil. Never had a problem spinning both wheels. Guess it could if the trac loc needed a rebuild, but it wouldn't matter what type of oil you used. All you need for the diff cover is RTV sealant. I use the orange RTV for the diff cover. The upper intake gasket can be found at most auto parts stores. I used the Fel-Pro and have re-used it several times with no problems. __________________ You're gonna need your seatbelt

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